Preheat oven to 425 degrees. Coat 2 baking sheets with cooking spray; set aside. Toss together potatoes, oil, and 1 teaspoon salt in a bowl. Arrange potatoes in a single layer on prepared baking sheets.
Bake, turning potatoes with a metal spatula 2 or 3 times and rotating sheets halfway through, until potatoes are crisp and edges turn golden brown, 18 to 20 minutes. Arrange potatoes on a large piece of parchment paper; let cool 5 minutes. Season with salt and pepper.